Pressure-tank alarm.



N9. 896,84L PATENTED AUG. 25, 1908,

' J. M.. LATIMER.

PRESSURE TANK ALARMn APPLICATION ILED SEPT. 1 1906.

2 SHEETS-SHEET 1,

No. 896,841. PATENTED AUG. 25, 1908. J. M. LATIMER.

PRESSURE TANK ALARM.

APPLICATION FILED SBPT.1, 1906.

2 SHEETS-SHEET Z.

UNITED sra'rss PATENT onirica.

A CGRPORATION F NEW YQRK.

PRESSURE-@TANK ALARM.

speeiaeeeien er Leteeseretena I originel eppneeeien mea september 1a,19er, serieu No. crassa Divided emi-em eepueeaen mea. september 1,1906.

serrer ne. atacan.

Patented Aug. 25, 19os.

' at Flushing, Queens county,` Long Islan system.

New York, have invented certain new and useful Improvements in Pressure-Tank Alarms, of which the following is a full, clear, and exactdescription. v My invention relates to improvements systems andapparatus for the automatic supervision of pressure conditions in tanks,for instance, for the su )ply of Water for re protcction, and is adivision from application Serial No. 278,S83,.filed September 18, 1905.Y The object of the invention is to provide a simple and reliable systemand mechanism for automatically affecting a main alarm cir cuit so as tonotify a central station upon variation in the pressure in( the supplytank.-

ing in an alarm in case the ressure alarm attachment is interferred witThe invention consists in improvements, the pri-nciples of which areillustrated in the accompanying two sheets ot drawings.

Briefly considered, the system comprises a circuit with a batteryconnected. through a resistance with the alarm attachment, and an alarmtransmitting rela all normally in series. One member oft e alarmattachment and the side of the battery adjacent the relay are grounded.The presqsure attachment consists of an expansion chamber normallysustaining a pair of multiplyinglevers out of contact with circuitpoints.

Figure 1 is a diagram of'a circuit and apparatus embodying theimprovements of my connected to the pressure tank 'for starting thealarm, Fig. 3 is a horizontal sectional view of the same. D

The tank T is supplied with water under pressure, and from it extend thedistributing pipes of the sprinkler,

' In communication with the tank is the alarm starting apparatus Pf. Tothis is connected the local circuit having branches 1 and 2, and thebattery B. The casing or frame of the pressure `attachment P isgrounded. at 3,l as, for instance, by Wire 14 connected to the pipetween the tank T and the pressure chamber or other fire protection.

4 communicating be- 11 4'The battery B is grounded at 5, as by` wlre 6.

The battery circuitis' normally closed' JoHN. LA'rIMEn, or rLUsHI'NG,New YORK, Assienoa rro ooNsoLiDa'rEn FIRE ALARM' coMPAuY, or NEW Yoan,N. Y., Y..

through the spring lcontact finger 8 and the adjustable contact screw 9,which are in con' tact with each other. A resistance 17 isiinterposed inbranch tween the battery B and contact screw 9. The relay coil 22 1sinterposed in branch 2 of -the local circuit between the battery and thespring nger 8. The .relay is normally energized and holds up thearmature 23.. De-

tails of the preferred form of relay' mechan ism for the transmission ofthe local alarms' to a central receiving a paratus are more fully shownand describe in my application No. 333,028 filed herewith.

The short `pivoted lever 12 rests upon the tip of the elastic orflexible expansion cham- Anothcr object is to provide, 1n conjunc. tionvwith such an apparatus, means for send.

ber 11, whose upper and lower walls are cor- .rugated disks. he lonpivoted lever 18 rests upon the tip 7 of ever 12 at a point near its ownaxis thus constituting a compound leverage contact controllingl device.he normal pressure in the tank T olds the .chamber 11 expanded to such adegree that levers 12 and 13' are held in the 'shown in Fig. 2, theextreme tip of eve'r 13 being in this position just above but out ofcontact with the end of the spring iin er 8'. Both of the levers and theexpansion camber, as well-as the casing of the attachment P, are allgrounded at 3.

In case the pressure in the tank falls be# low a redetermined minimum,the chamber 11 col apses and lets down lever 12 and by gravity the lever13 falls so that its tip1 engages the finger 8. This immediately s ort-'circuits the relay coil 22, so that its arma'- tre 23v falls and startsthe transmitting mechanism. In case the decrease of pressure is onlymomentary, the short-circuit will .be immediately removed by the upwardswinging of lever. 13 sion of chamber 11.- sure continues, the lever 13will continue to .fall and its weight is sufficient to pull .down thespringin er 8 from its engagement with contact 9. T is opens the batterycircuit.

1 ci the local circuit beosition caused by the expan- In case the lowpres,

The spring 15 is connected to branch 1 of i 17 out of engagement d bythecover r with spring 15, but in trolledv by Lsaid p. mally kept out cuit,a palr of contacts 1n sald circuit adap case the cover is tampered with,the plunger' is released and contacts with spring 15, so as' to groundthe`circuit and dene'rgrae the' relay and send in an alarm.

What I claim is:

1. The combination of a local circuit, a relay and source of currenttherein, a pressure` alarm attachment comprising a pressure chamber, agrounded system of levers conpressure chamber and norof engagement withsaid cii te to be engaged and se arated by said system of levers, aCasin in`c osing and protecting all of said parts and having a removablecover, and a contact devicenormallyheld by said cover from engagementwith said circuit, said contact device being connected to ground.

2. An alarm starting device comprising a casing containing a pressurechamber having a, movable Wall, a lever supported thereby, a secondlever moving in one direction under lever, a air o to comp ete a localclrcuit, sald second lever 2 the action ravity supported by said rstcontacts normally closed so as being grounded and ada ted to se aratesaid contacts and ground sai circuit w en free to move upon reduction ofpressure Within said chamber.

3. In an alarm system, a local circuit including a 'pair of contactsnormally in engagement, a pressure chamber, a contact controlling deviceactuated by said pressure chamber and adapted to separate said contactssaid contact-controlling device being grounded and normally out ofengagement with said circuit but adapted to make electric engagementtherewith when the pressure becomes abnormal.

JOHN M. -LATIMER Witnesses L VREELAND, Roar. S. ALLYN.

when the pressure becomes abnormal,

